closes#6094
- adds 404-handler mixin
- applies mixin to settings/tags/tag, editor/edit and team/user routes
- adds adapter-error test helper to override the default adapter error
no issue
- add ember-suave dependency
- upgrade grunt-jscs dependency
- add a new .jscsrc for the client's tests directory that extends from client's base .jscsrc
- separate client tests in Gruntfile jscs task so they pick up the test's .jscsrc
- standardize es6 usage across client
no issue
- upgrades ember-cli, ember-cli-mocha, ember-mocha dependencies
- switches Brocfile.js to ember-cli-build.js
- fixes controller tests with missing needs
Pulled into a separate PR as it doesn't affect running code but does provide access to the very useful component integration tests.
